Section 8
Maintenance and Service
Warning
Dangerous voltages exist within this unit. Service should be
performed only by qualified personnel. Disconnect the unit from its
electrical source. Remove the shelves and thermometer if supplied.
Disconnecting any component from the circuit without prior removal of
the power source may cause damage to other circuit components.
V
1. Make sure vent shutter cap is not closed. Open to the maximum
position.
2. Test the unit when empty; if results are satisfactory the chamber was
improperly loaded. Redistribute the load.
3. Be sure to allow ample time for an empty chamber to stabilize at the
desired temperature setting. It could take over one hour to equilibrate
depending upon the difference between ambient and operating
temperatures. The mass of the load can also affect stabilization time.
4. Make certain severe line voltage fluctuations are not occurring.
5. Make certain all wire connections are secure at their terminals.
6. Make certain that an intermittent failure of the switch, thermostat or
wiring has not occurred. Isolate the cause; repair or replace.
3177885 Thelco Oven 8-1
Thermo Electron Corporation
Temperature Variance
or Fluctuation
